fix colon in mirc when renaming self

--HG--
branch : nmdc-ircfrontend

server.go

@@ -335,11 +335,17 @@ func (s *Server) handleCommand(command string, args []string) {
 			return
 		}
 
+		// mIRC puts a colon in first place when changing nick, hexchat doesn't
+		suppliedNick := args[0]
+		if len(suppliedNick) >= 2 && suppliedNick[0] == ':' {
+			suppliedNick = suppliedNick[1:]
+		}
+
 		if s.clientNick() == "" {
 			// allow set, as part of the login phase
-			s.upstreamLauncher.Self.Nick = args[0]
+			s.upstreamLauncher.Self.Nick = suppliedNick
 
-		} else if args[0] == s.clientNick() {
+		} else if suppliedNick == s.clientNick() {
 			// Ignore
 			// Required for compatibility with Lite IRC, which sends USER/NICK in the wrong order
 
@@ -349,9 +355,12 @@ func (s *Server) handleCommand(command string, args []string) {
 			defer s.ClientStateLock.Unlock()
 			if s.upstream == nil {
 				// Not yet connected, should be safe to change nick
-				s.upstreamLauncher.Self.Nick = args[0]
+				s.upstreamLauncher.Self.Nick = suppliedNick
 			} else {
 				// Need to disconnect/reconnect the upstream
+				s.writeClient(fmt.Sprintf(":%s!%s@%s NICK %s", s.clientNick(), s.clientNick(), s.clientNick(), suppliedNick)) // notify client about what they've done
+				s.upstreamLauncher.Self.Nick = suppliedNick
+
 				s.nickChangeAttempt++
 				s.upstream.Disconnect()
 			}